Akaashi, Kenma and Atsumu tied, Oikawa, then Kageyama. If we're talking like, volleyball game intelligence then Kageyama, Oikawa, Akaashi, Kenma, and Atsumu. Kageyama has really, really good game sense. Oikawa does too, and he's probably where Kags learned it from. Akaashi has good game sense and weighs pros and cons in his mind. Kenma is pretty smart but it takes him a little bit to read the other team and he usually focuses on doing the least amount of work possible hence why he's 4th. Atsumu just wants to mess around and show off with osamu imo. He's still really smart, but in a different way.